CCS FH32 is a high-strength marine steel plate certified by the China Classification Society (CCS) for shipbuilding and offshore applications . The "FH" designation signifies it is a high-strength grade with impact toughness tested at the exceptionally low temperature of -60°C, ensuring reliable performance in polar and Arctic environments . It has a minimum yield strength of 315 MPa and tensile strength ranging from 440 to 590 MPa, with minimum elongation of 22% . Its chemical composition is strictly controlled, with carbon ≤0.16% and manganese 0.90-1.60% . This grade is widely used for hull structures, offshore platforms, and ice-class vessels requiring superior low-temperature toughness .
CCS FH40 is an extra-high-strength marine steel plate also certified by CCS, manufactured through normalized, TMCP, or quenched and tempered conditions . The "40" denotes a minimum yield strength of 390 MPa and tensile strength ranging from 510 to 660 MPa, with minimum elongation of 20% . Like FH32, it is impact tested at -60°C, with minimum impact energy requirements of 41J (longitudinal) for thicknesses up to 50mm . This grade is designed for demanding structural components in shipbuilding, offshore drilling units, and marine structures requiring superior strength.
Both CCS FH32 and CCS FH40 are CCS-certified high-strength marine steels with exceptional low-temperature toughness tested at -60°C, ensuring reliable performance in the most extreme Arctic and harsh marine environments . Their primary difference lies in strength level: FH32 offers a minimum yield strength of 315 MPa with tensile strength of 440-590 MPa, suitable for general high-strength hull construction and offshore platforms, while FH40 provides a higher minimum yield strength of 390 MPa with tensile strength reaching 510-660 MPa, designed for more demanding load-bearing applications requiring superior strength . Both grades feature strictly controlled chemical composition (carbon ≤0.16%) and maintain good weldability for critical marine service.
CCS FH32 high Strength Max Chemical Composition in Tempering and Quenching
|
Grade |
C % |
Si % |
Mn % |
P % |
S % |
V % |
AL% |
Cr % |
|
CCS FH32 |
0.160 |
0.10-0.5 |
0.9-1.6 |
0.025 |
0.025 |
0.05-0.10 |
0.015 |
0.200 |
|
Cu % |
Mo % |
Nb % |
Ni % |
Ti % |
N % |
|
|
|
|
0.350 |
0.080 |
0.02-0.05 |
0.080 |
0.020 |
0.012 |
|
|
CCS FH40 high Strength Max Chemical Composition in Tempering and Quenching
|
Element |
CCS FH40 Max % |
Element |
CCS FH40 Max % |
|
C |
0.16 |
Ni |
0.40 |
|
Mn |
0.90-1.60 |
Mo |
0.08 |
|
Si |
0.50 |
Al |
0.0015 min |
|
S |
0.025 |
Nb |
0.20-0.05 |
|
P |
0.025 |
V |
0.05-0.10 |
|
Cu |
0.35 |
Ti |
0.02 |
|
Cr |
0.20 |
N |
0.009 |
CCS FH32 high strength property in tempering and quenching
|
Grade |
Thickness(mm) |
Min Yield (Mpa) |
Tensile(MPa) |
Elongation (%) |
Min Impact Energy |
|
|
CCS FH32 |
8mm-50mm |
Min 315Mpa |
440-590Mpa |
22% |
-60 |
34J |
|
51mm-70mm |
Min 315Mpa |
440-590Mpa |
22% |
-60 |
NA |
|
|
71mm-100mm |
Min 315Mpa |
440-590Mpa |
22% |
-60 |
NA |
|
CCS FH40 high strength property in tempering and quenching
|
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
|
|
|
|
-60 degree |
|
|
CCS FH40 |
8-220 |
390 |
510-650 |
20 |
41J |
